// Time scale tests
describe('Time scale tests', function() {
	describe('auto', jasmine.fixture.specs('scale.time'));

	function createScale(data, options, dimensions) {
		var width = (dimensions && dimensions.width) || 400;
		var height = (dimensions && dimensions.height) || 50;

		options = options || {};
		options.type = 'time';
		options.id = 'xScale0';

		var chart = window.acquireChart({
			type: 'line',
			data: data,
			options: {
				scales: {
					x: options
				}
			}
		}, {canvas: {width: width, height: height}});


		return chart.scales.x;
	}

	function getLabels(scale) {
		return scale.ticks.map(t => t.label);
	}

	beforeEach(function() {
		// Need a time matcher for getValueFromPixel
		jasmine.addMatchers({
			toBeCloseToTime: function() {
				return {
					compare: function(time, expected) {
						var result = false;
						var actual = moment(time);
						var diff = actual.diff(expected.value, expected.unit, true);
						result = Math.abs(diff) < (expected.threshold !== undefined ? expected.threshold : 0.01);

						return {
							pass: result
						};
					}
				};
			}
		});
	});

	it('should load moment.js as a dependency', function() {
		expect(window.moment).not.toBe(undefined);
	});

	it('should register the constructor with the registry', function() {
		var Constructor = Chart.registry.getScale('time');
		expect(Constructor).not.toBe(undefined);
		expect(typeof Constructor).toBe('function');
	});

	it('should have the correct default config', function() {
		var defaultConfig = Chart.defaults.scales.time;
		expect(defaultConfig).toEqual({
			bounds: 'data',
			adapters: {},
			time: {
				parser: false, // false == a pattern string from or a custom callback that converts its argument to a timestamp
				unit: false, // false == automatic or override with week, month, year, etc.
				round: false, // none, or override with week, month, year, etc.
				isoWeekday: false, // override week start day
				minUnit: 'millisecond',
				displayFormats: {}
			},
			ticks: {
				source: 'auto',
				major: {
					enabled: false
				}
			}
		});
	});

	it('should correctly determine the unit', function() {
		var date = moment('Jan 01 1990', 'MMM DD YYYY');
		var data = [];
		for (var i = 0; i < 60; i++) {
			data.push({x: date.valueOf(), y: Math.random()});
			date = date.clone().add(1, 'month');
		}

		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'x',
					data: data
				}],
			},
			options: {
				scales: {
					x: {
						type: 'time',
						ticks: {
							source: 'data',
							autoSkip: true
						}
					},
				}
			}
		});

		var scale = chart.scales.x;

		expect(scale._unit).toEqual('month');
	});

	describe('when specifying limits', function() {
		var mockData = {
			labels: ['2015-01-01T20:00:00', '2015-01-02T20:00:00', '2015-01-03T20:00:00'],
		};

		var config;
		beforeEach(function() {
			config = Chart.helpers.clone(Chart.defaults.scales.time);
			config.ticks.source = 'labels';
			config.time.unit = 'day';
		});

		it('should use the min option when less than first label for building ticks', function() {
			config.min = '2014-12-29T04:00:00';

			var labels = getLabels(createScale(mockData, config));
			expect(labels[0]).toEqual('Jan 1');
		});

		it('should use the min option when greater than first label for building ticks', function() {
			config.min = '2015-01-02T04:00:00';

			var labels = getLabels(createScale(mockData, config));
			expect(labels[0]).toEqual('Jan 2');
		});

		it('should use the max option when greater than last label for building ticks', function() {
			config.max = '2015-01-05T06:00:00';

			var labels = getLabels(createScale(mockData, config));
			expect(labels[labels.length - 1]).toEqual('Jan 3');
		});

		it('should use the max option when less than last label for building ticks', function() {
			config.max = '2015-01-02T23:00:00';

			var labels = getLabels(createScale(mockData, config));
			expect(labels[labels.length - 1]).toEqual('Jan 2');
		});
	});

	it('should use the isoWeekday option', function() {
		var mockData = {
			labels: [
				'2015-01-01T20:00:00', // Thursday
				'2015-01-02T20:00:00', // Friday
				'2015-01-03T20:00:00' // Saturday
			]
		};

		var config = Chart.helpers.mergeIf({
			bounds: 'ticks',
			time: {
				unit: 'week',
				isoWeekday: 3 // Wednesday
			}
		}, Chart.defaults.scales.time);

		var scale = createScale(mockData, config);
		var ticks = getLabels(scale);

		expect(ticks).toEqual(['Dec 31, 2014', 'Jan 7, 2015']);
	});

	describe('when rendering several days', function() {
		beforeEach(function() {
			this.chart = window.acquireChart({
				type: 'line',
				data: {
					datasets: [{
						xAxisID: 'x',
						data: []
					}],
					labels: [
						'2015-01-01T20:00:00',
						'2015-01-02T21:00:00',
						'2015-01-03T22:00:00',
						'2015-01-05T23:00:00',
						'2015-01-07T03:00',
						'2015-01-08T10:00',
						'2015-01-10T12:00'
					]
				},
				options: {
					scales: {
						x: {
							type: 'time',
							position: 'bottom'
						},
					}
				}
			});

			this.scale = this.chart.scales.x;
		});

		it('should be bounded by the nearest week beginnings', function() {
			var chart = this.chart;
			var scale = this.scale;
			expect(scale.getValueForPixel(scale.left)).toBeGreaterThan(moment(chart.data.labels[0]).startOf('week'));
			expect(scale.getValueForPixel(scale.right)).toBeLessThan(moment(chart.data.labels[chart.data.labels.length - 1]).add(1, 'week').endOf('week'));
		});

		it('should convert between screen coordinates and times', function() {
			var chart = this.chart;
			var scale = this.scale;
			var timeRange = moment(scale.max).valueOf() - moment(scale.min).valueOf();
			var msPerPix = timeRange / scale.width;
			var firstPointOffsetMs = moment(chart.config.data.labels[0]).valueOf() - scale.min;
			var firstPointPixel = scale.left + firstPointOffsetMs / msPerPix;
			var lastPointOffsetMs = moment(chart.config.data.labels[chart.config.data.labels.length - 1]).valueOf() - scale.min;
			var lastPointPixel = scale.left + lastPointOffsetMs / msPerPix;

			expect(scale.getPixelForValue(moment('2015-01-01T20:00:00').valueOf())).toBeCloseToPixel(firstPointPixel);
			expect(scale.getPixelForValue(moment(chart.data.labels[0]).valueOf())).toBeCloseToPixel(firstPointPixel);
			expect(scale.getValueForPixel(firstPointPixel)).toBeCloseToTime({
				value: moment(chart.data.labels[0]),
				unit: 'hour',
			});

			expect(scale.getPixelForValue(moment('2015-01-10T12:00').valueOf())).toBeCloseToPixel(lastPointPixel);
			expect(scale.getValueForPixel(lastPointPixel)).toBeCloseToTime({
				value: moment(chart.data.labels[6]),
				unit: 'hour'
			});
		});
	});

	describe('when rendering several years', function() {
		beforeEach(function() {
			this.chart = window.acquireChart({
				type: 'line',
				data: {
					labels: ['2005-07-04', '2017-01-20'],
				},
				options: {
					scales: {
						x: {
							type: 'time',
							bounds: 'ticks',
							position: 'bottom'
						},
					}
				}
			}, {canvas: {width: 800, height: 200}});

			this.scale = this.chart.scales.x;
		});

		it('should be bounded by nearest step\'s year start and end', function() {
			var scale = this.scale;
			var ticks = scale.getTicks();
			var step = ticks[1].value - ticks[0].value;
			var stepsAmount = Math.floor((scale.max - scale.min) / step);

			expect(scale.getValueForPixel(scale.left)).toBeCloseToTime({
				value: moment(scale.min).startOf('year'),
				unit: 'hour',
			});
			expect(scale.getValueForPixel(scale.right)).toBeCloseToTime({
				value: moment(scale.min + step * stepsAmount).endOf('year'),
				unit: 'hour',
			});
		});

		it('should build the correct ticks', function() {
			expect(getLabels(this.scale)).toEqual(['2005', '2006', '2007', '2008', '2009', '2010', '2011', '2012', '2013', '2014', '2015', '2016', '2017', '2018']);
		});

		it('should have ticks with accurate labels', function() {
			var scale = this.scale;
			var ticks = scale.getTicks();
			// pixelsPerTick is an aproximation which assumes same number of milliseconds per year (not true)
			// we use a threshold of 1 day so that we still match these values
			var pixelsPerTick = scale.width / (ticks.length - 1);

			for (var i = 0; i < ticks.length - 1; i++) {
				var offset = pixelsPerTick * i;
				expect(scale.getValueForPixel(scale.left + offset)).toBeCloseToTime({
					value: moment(ticks[i].label + '-01-01'),
					unit: 'day',
					threshold: 1,
				});
			}
		});
	});

	it('should get the correct label for a data value', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'x',
					data: [null, 10, 3]
				}],
				labels: ['2015-01-01T20:00:00', '2015-01-02T21:00:00', '2015-01-03T22:00:00', '2015-01-05T23:00:00', '2015-01-07T03:00', '2015-01-08T10:00', '2015-01-10T12:00'], // days
			},
			options: {
				scales: {
					x: {
						type: 'time',
						position: 'bottom',
						ticks: {
							source: 'labels',
							autoSkip: false
						}
					}
				}
			}
		});

		var xScale = chart.scales.x;
		var controller = chart.getDatasetMeta(0).controller;
		expect(xScale.getLabelForValue(controller.getParsed(0)[xScale.id])).toBeTruthy();
		expect(xScale.getLabelForValue(controller.getParsed(0)[xScale.id])).toBe('Jan 1, 2015, 8:00:00 pm');
		expect(xScale.getLabelForValue(xScale.getValueForPixel(xScale.getPixelForTick(6)))).toBe('Jan 10, 2015, 12:00:00 pm');
	});

	describe('when ticks.callback is specified', function() {
		beforeEach(function() {
			this.chart = window.acquireChart({
				type: 'line',
				data: {
					datasets: [{
						xAxisID: 'x',
						data: [0, 0]
					}],
					labels: ['2015-01-01T20:00:00', '2015-01-01T20:01:00']
				},
				options: {
					scales: {
						x: {
							type: 'time',
							time: {
								displayFormats: {
									second: 'h:mm:ss'
								}
							},
							ticks: {
								callback: function(value) {
									return '<' + value + '>';
								}
							}
						}
					}
				}
			});
			this.scale = this.chart.scales.x;
		});

		it('should get the correct labels for ticks', function() {
			var labels = getLabels(this.scale);

			expect(labels.length).toEqual(21);
			expect(labels[0]).toEqual('<8:00:00>');
			expect(labels[labels.length - 1]).toEqual('<8:01:00>');
		});

		it('should update ticks.callback correctly', function() {
			var chart = this.chart;
			chart.options.scales.x.ticks.callback = function(value) {
				return '{' + value + '}';
			};
			chart.update();

			var labels = getLabels(this.scale);
			expect(labels.length).toEqual(21);
			expect(labels[0]).toEqual('{8:00:00}');
			expect(labels[labels.length - 1]).toEqual('{8:01:00}');
		});
	});

	it('should get the correct label when time is specified as a string', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'x',
					data: [{x: '2015-01-01T20:00:00', y: 10}, {x: '2015-01-02T21:00:00', y: 3}]
				}],
			},
			options: {
				scales: {
					x: {
						type: 'time',
						position: 'bottom'
					},
				}
			}
		});

		var xScale = chart.scales.x;
		var controller = chart.getDatasetMeta(0).controller;
		var value = controller.getParsed(0)[xScale.id];
		expect(xScale.getLabelForValue(value)).toBeTruthy();
		expect(xScale.getLabelForValue(value)).toBe('Jan 1, 2015, 8:00:00 pm');
	});

	it('should round to isoWeekday', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					data: [{x: '2020-04-12T20:00:00', y: 1}, {x: '2020-04-13T20:00:00', y: 2}]
				}]
			},
			options: {
				scales: {
					x: {
						type: 'time',
						ticks: {
							source: 'data'
						},
						time: {
							unit: 'week',
							round: 'week',
							isoWeekday: 1,
							displayFormats: {
								week: 'WW'
							}
						}
					},
				}
			}
		});

		expect(getLabels(chart.scales.x)).toEqual(['15', '16']);
	});

	it('should get the correct label for a timestamp', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					xAxisID: 'x',
					data: [
						{t: +new Date('2018-01-08 05:14:23.234'), y: 10},
						{t: +new Date('2018-01-09 06:17:43.426'), y: 3}
					]
				}],
			},
			options: {
				parsing: {xAxisKey: 't'},
				scales: {
					x: {
						type: 'time',
						position: 'bottom'
					},
				}
			}
		});

		var xScale = chart.scales.x;
		var controller = chart.getDatasetMeta(0).controller;
		var label = xScale.getLabelForValue(controller.getParsed(0)[xScale.id]);
		expect(label).toEqual('Jan 8, 2018, 5:14:23 am');
	});

	it('should get the correct pixel for only one data in the dataset', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				labels: ['2016-05-27'],
				datasets: [{
					xAxisID: 'x',
					data: [5]
				}]
			},
			options: {
				scales: {
					x: {
						display: true,
						type: 'time'
					}
				}
			}
		});

		var xScale = chart.scales.x;
		var pixel = xScale.getPixelForValue(moment('2016-05-27').valueOf());

		expect(xScale.getValueForPixel(pixel)).toEqual(moment(chart.data.labels[0]).valueOf());
	});

	it('does not create a negative width chart when hidden', function() {
		var chart = window.acquireChart({
			type: 'line',
			data: {
				datasets: [{
					data: []
				}]
			},
			options: {
				scales: {
					x: {
						type: 'time',
						ticks: {
							min: moment().subtract(1, 'months'),
							max: moment(),
						}
					},
				},
				responsive: true,
			},
		}, {
			wrapper: {
				style: 'display: none',
			},
		});
		expect(chart.scales.y.width).toEqual(0);
		expect(chart.scales.y.maxWidth).toEqual(0);
		expect(chart.width).toEqual(0);
	});

	describe('when ticks.source', function() {
		describe('is "labels"', function() {
			beforeEach(function() {
				this.chart = window.acquireChart({
					type: 'line',
					data: {
						labels: ['2017', '2019', '2020', '2025', '2042'],
						datasets: [{data: [0, 1, 2, 3, 4, 5]}]
					},
					options: {
						scales: {
							x: {
								type: 'time',
								time: {
									parser: 'YYYY'
								},
								ticks: {
									source: 'labels'
								}
							}
						}
					}
				});
			});

			it ('should generate ticks from "data.labels"', function() {
				var scale = this.chart.scales.x;

				expect(scale.min).toEqual(+moment('2017', 'YYYY'));
				expect(scale.max).toEqual(+moment('2042', 'YYYY'));
				expect(getLabels(scale)).toEqual([
					'2017', '2019', '2020', '2025', '2042']);
			});
			it ('should not add ticks for min and max if they extend the labels range', function() {
				var chart = this.chart;
				var scale = chart.scales.x;
				var options = chart.options.scales.x;

				options.min = '2012';
				options.max = '2051';
				chart.update();

				expect(scale.min).toEqual(+moment('2012', 'YYYY'));
				expect(scale.max).toEqual(+moment('2051', 'YYYY'));
				expect(getLabels(scale)).toEqual([
					'2017', '2019', '2020', '2025', '2042']);
			});
			it ('should not duplicate ticks if min and max are the labels limits', function() {
				var chart = this.chart;
				var scale = chart.scales.x;
				var options = chart.options.scales.x;

				options.min = '2017';
				options.max = '2042';
				chart.update();

				expect(scale.min).toEqual(+moment('2017', 'YYYY'));
				expect(scale.max).toEqual(+moment('2042', 'YYYY'));
				expect(getLabels(scale)).toEqual([
					'2017', '2019', '2020', '2025', '2042']);
			});
			it ('should correctly handle empty `data.labels` using "day" if `time.unit` is undefined`', function() {
				var chart = this.chart;
				var scale = chart.scales.x;

				chart.data.labels = [];
				chart.update();

				expect(scale.min).toEqual(+moment().startOf('day'));
				expect(scale.max).toEqual(+moment().endOf('day') + 1);
				expect(getLabels(scale)).toEqual([]);
			});
			it ('should correctly handle empty `data.labels` using `time.unit`', function() {
				var chart = this.chart;
				var scale = chart.scales.x;
				var options = chart.options.scales.x;

				options.time.unit = 'year';
				chart.data.labels = [];
				chart.update();

				expect(scale.min).toEqual(+moment().startOf('year'));
				expect(scale.max).toEqual(+moment().endOf('year') + 1);
				expect(getLabels(scale)).toEqual([]);
			});
		});

		describe('is "data"', function() {
			beforeEach(function() {
				this.chart = window.acquireChart({
					type: 'line',
					data: {
						labels: ['2017', '2019', '2020', '2025', '2042'],
						datasets: [
							{data: [0, 1, 2, 3, 4, 5]},
							{data: [
								{x: '2018', y: 6},
								{x: '2020', y: 7},
								{x: '2043', y: 8}
							]}
						]
					},
					options: {
						scales: {
							x: {
								type: 'time',
								time: {
									parser: 'YYYY'
								},
								ticks: {
									source: 'data'
								}
							}
						}
					}
				});
			});

			it ('should generate ticks from "datasets.data"', function() {
				var scale = this.chart.scales.x;

				expect(scale.min).toEqual(+moment('2017', 'YYYY'));
				expect(scale.max).toEqual(+moment('2043', 'YYYY'));
				expect(getLabels(scale)).toEqual([
					'2017', '2018', '2019', '2020', '2025', '2042', '2043']);
			});
			it ('should not add ticks for min and max if they extend the labels range', function() {
				var chart = this.chart;
				var scale = chart.scales.x;
				var options = chart.options.scales.x;

				options.min = '2012';
				options.max = '2051';
				chart.update();

				expect(scale.min).toEqual(+moment('2012', 'YYYY'));
				expect(scale.max).toEqual(+moment('2051', 'YYYY'));
				expect(getLabels(scale)).toEqual([
					'2017', '2018', '2019', '2020', '2025', '2042', '2043']);
			});
			it ('should not duplicate ticks if min and max are the labels limits', function() {
				var chart = this.chart;
				var scale = chart.scales.x;
				var options = chart.options.scales.x;

				options.min = '2017';
				options.max = '2043';
				chart.update();

				expect(scale.min).toEqual(+moment('2017', 'YYYY'));
				expect(scale.max).toEqual(+moment('2043', 'YYYY'));
				expect(getLabels(scale)).toEqual([
					'2017', '2018', '2019', '2020', '2025', '2042', '2043']);
			});
			it ('should correctly handle empty `data.labels` using "day" if `time.unit` is undefined`', function() {
				var chart = this.chart;
				var scale = chart.scales.x;

				chart.data.labels = [];
				chart.update();

				expect(scale.min).toEqual(+moment('2018', 'YYYY'));
				expect(scale.max).toEqual(+moment('2043', 'YYYY'));
				expect(getLabels(scale)).toEqual([
					'2018', '2020', '2043']);
			});
			it ('should correctly handle empty `data.labels` and hidden datasets using `time.unit`', function() {
				var chart = this.chart;
				var scale = chart.scales.x;
				var options = chart.options.scales.x;

				options.time.unit = 'year';
				chart.data.labels = [];
				var meta = chart.getDatasetMeta(1);
				meta.hidden = true;
				chart.update();

				expect(scale.min).toEqual(+moment().startOf('year'));
				expect(scale.max).toEqual(+moment().endOf('year') + 1);
				expect(getLabels(scale)).toEqual([]);
			});
		});
	});

	[true, false].forEach(function(normalized) {
		describe('when normalized is ' + normalized + ' and scale type', function() {
			describe('is "timeseries"', function() {
				beforeEach(function() {
					this.chart = window.acquireChart({
						type: 'line',
						data: {
							labels: ['2017', '2019', '2020', '2025', '2042'],
							datasets: [{data: [0, 1, 2, 3, 4]}]
						},
						options: {
							normalized,
							scales: {
								x: {
									type: 'timeseries',
									time: {
										parser: 'YYYY'
									},
									ticks: {
										source: 'labels'
									}
								},
								y: {
									display: false
								}
							}
						}
					});
				});

				it ('should space data out with the same gap, whatever their time values', function() {
					var scale = this.chart.scales.x;
					var start = scale.left;
					var slice = scale.width / 4;

					expect(scale.getPixelForValue(moment('2017').valueOf(), 0)).toBeCloseToPixel(start);
					expect(scale.getPixelForValue(moment('2019').valueOf(), 1)).toBeCloseToPixel(start + slice);
					expect(scale.getPixelForValue(moment('2020').valueOf(), 2)).toBeCloseToPixel(start + slice * 2);
					expect(scale.getPixelForValue(moment('2025').valueOf(), 3)).toBeCloseToPixel(start + slice * 3);
					expect(scale.getPixelForValue(moment('2042').valueOf(), 4)).toBeCloseToPixel(start + slice * 4);
				});
				it ('should add a step before if scale.min is before the first data', function() {
					var chart = this.chart;
					var scale = chart.scales.x;
					var options = chart.options.scales.x;

					options.min = '2012';
					chart.update();

					var start = scale.left;
					var slice = scale.width / 5;

					expect(scale.getPixelForValue(moment('2017').valueOf(), 1)).toBeCloseToPixel(start + slice);
					expect(scale.getPixelForValue(moment('2042').valueOf(), 5)).toBeCloseToPixel(start + slice * 5);
				});
				it ('should add a step after if scale.max is after the last data', function() {
					var chart = this.chart;
					var scale = chart.scales.x;
					var options = chart.options.scales.x;

					options.max = '2050';
					chart.update();

					var start = scale.left;
					var slice = scale.width / 5;

					expect(scale.getPixelForValue(moment('2017').valueOf(), 0)).toBeCloseToPixel(start);
					expect(scale.getPixelForValue(moment('2042').valueOf(), 4)).toBeCloseToPixel(start + slice * 4);
				});
				it ('should add steps before and after if scale.min/max are outside the data range', function() {
					var chart = this.chart;
					var scale = chart.scales.x;
					var options = chart.options.scales.x;

					options.min = '2012';
					options.max = '2050';
					chart.update();

					var start = scale.left;
					var slice = scale.width / 6;

					expect(scale.getPixelForValue(moment('2017').valueOf(), 1)).toBeCloseToPixel(start + slice);
					expect(scale.getPixelForValue(moment('2042').valueOf(), 5)).toBeCloseToPixel(start + slice * 5);
				});
			});
			describe('is "time"', function() {
				beforeEach(function() {
					this.chart = window.acquireChart({
						type: 'line',
						data: {
							labels: ['2017', '2019', '2020', '2025', '2042'],
							datasets: [{data: [0, 1, 2, 3, 4, 5]}]
						},
						options: {
							scales: {
								x: {
									type: 'time',
									time: {
										parser: 'YYYY'
									},
									ticks: {
										source: 'labels'
									}
								},
								y: {
									display: false
								}
							}
						}
					});
				});

				it ('should space data out with a gap relative to their time values', function() {
					var scale = this.chart.scales.x;
					var start = scale.left;
					var slice = scale.width / (2042 - 2017);

					expect(scale.getPixelForValue(moment('2017').valueOf(), 0)).toBeCloseToPixel(start);
					expect(scale.getPixelForValue(moment('2019').valueOf(), 1)).toBeCloseToPixel(start + slice * (2019 - 2017));
					expect(scale.getPixelForValue(moment('2020').valueOf(), 2)).toBeCloseToPixel(start + slice * (2020 - 2017));
					expect(scale.getPixelForValue(moment('2025').valueOf(), 3)).toBeCloseToPixel(start + slice * (2025 - 2017));
					expect(scale.getPixelForValue(moment('2042').valueOf(), 4)).toBeCloseToPixel(start + slice * (2042 - 2017));
				});
				it ('should take in account scale min and max if outside the ticks range', function() {
					var chart = this.chart;
					var scale = chart.scales.x;
					var options = chart.options.scales.x;

					options.min = '2012';
					options.max = '2050';
					chart.update();

					var start = scale.left;
					var slice = scale.width / (2050 - 2012);

					expect(scale.getPixelForValue(moment('2017').valueOf(), 0)).toBeCloseToPixel(start + slice * (2017 - 2012));
					expect(scale.getPixelForValue(moment('2019').valueOf(), 1)).toBeCloseToPixel(start + slice * (2019 - 2012));
					expect(scale.getPixelForValue(moment('2020').valueOf(), 2)).toBeCloseToPixel(start + slice * (2020 - 2012));
					expect(scale.getPixelForValue(moment('2025').valueOf(), 3)).toBeCloseToPixel(start + slice * (2025 - 2012));
					expect(scale.getPixelForValue(moment('2042').valueOf(), 4)).toBeCloseToPixel(start + slice * (2042 - 2012));
				});
			});
		});
	});

	describe('when bounds', function() {
		describe('is "data"', function() {
			it ('should preserve the data range', function() {
				var chart = window.acquireChart({
					type: 'line',
					data: {
						labels: ['02/20 08:00', '02/21 09:00', '02/22 10:00', '02/23 11:00'],
						datasets: [{data: [0, 1, 2, 3, 4, 5]}]
					},
					options: {
						scales: {
							x: {
								type: 'time',
								bounds: 'data',
								time: {
									parser: 'MM/DD HH:mm',
									unit: 'day'
								}
							},
							y: {
								display: false
							}
						}
					}
				});

				var scale = chart.scales.x;

				expect(scale.min).toEqual(+moment('02/20 08:00', 'MM/DD HH:mm'));
				expect(scale.max).toEqual(+moment('02/23 11:00', 'MM/DD HH:mm'));
				expect(scale.getPixelForValue(moment('02/20 08:00', 'MM/DD HH:mm').valueOf())).toBeCloseToPixel(scale.left);
				expect(scale.getPixelForValue(moment('02/23 11:00', 'MM/DD HH:mm').valueOf())).toBeCloseToPixel(scale.left + scale.width);
				expect(getLabels(scale)).toEqual([
					'Feb 21', 'Feb 22', 'Feb 23']);
			});
		});

		describe('is "labels"', function() {
			it('should preserve the label range', function() {
				var chart = window.acquireChart({
					type: 'line',
					data: {
						labels: ['02/20 08:00', '02/21 09:00', '02/22 10:00', '02/23 11:00'],
						datasets: [{data: [0, 1, 2, 3, 4, 5]}]
					},
					options: {
						scales: {
							x: {
								type: 'time',
								bounds: 'ticks',
								time: {
									parser: 'MM/DD HH:mm',
									unit: 'day'
								}
							},
							y: {
								display: false
							}
						}
					}
				});

				var scale = chart.scales.x;
				var ticks = scale.getTicks();

				expect(scale.min).toEqual(ticks[0].value);
				expect(scale.max).toEqual(ticks[ticks.length - 1].value);
				expect(scale.getPixelForValue(moment('02/20 08:00', 'MM/DD HH:mm').valueOf())).toBeCloseToPixel(60);
				expect(scale.getPixelForValue(moment('02/23 11:00', 'MM/DD HH:mm').valueOf())).toBeCloseToPixel(426);
				expect(getLabels(scale)).toEqual([
					'Feb 20', 'Feb 21', 'Feb 22', 'Feb 23', 'Feb 24']);
			});
		});
	});

	describe('when min and/or max are defined', function() {
		['auto', 'data', 'labels'].forEach(function(source) {
			['data', 'ticks'].forEach(function(bounds) {
				describe('and ticks.source is "' + source + '" and bounds "' + bounds + '"', function() {
					beforeEach(function() {
						this.chart = window.acquireChart({
							type: 'line',
							data: {
								labels: ['02/20 08:00', '02/21 09:00', '02/22 10:00', '02/23 11:00'],
								datasets: [{data: [0, 1, 2, 3, 4, 5]}]
							},
							options: {
								scales: {
									x: {
										type: 'time',
										bounds: bounds,
										time: {
											parser: 'MM/DD HH:mm',
											unit: 'day'
										},
										ticks: {
											source: source
										}
									},
									y: {
										display: false
									}
								}
							}
						});
					});

					it ('should expand scale to the min/max range', function() {
						var chart = this.chart;
						var scale = chart.scales.x;
						var options = chart.options.scales.x;
						var min = '02/19 07:00';
						var max = '02/24 08:00';
						var minMillis = +moment(min, 'MM/DD HH:mm');
						var maxMillis = +moment(max, 'MM/DD HH:mm');

						options.min = min;
						options.max = max;
						chart.update();

						expect(scale.min).toEqual(minMillis);
						expect(scale.max).toEqual(maxMillis);
						expect(scale.getPixelForValue(minMillis)).toBeCloseToPixel(scale.left);
						expect(scale.getPixelForValue(maxMillis)).toBeCloseToPixel(scale.left + scale.width);
						scale.getTicks().forEach(function(tick) {
							expect(tick.value >= minMillis).toBeTruthy();
							expect(tick.value <= maxMillis).toBeTruthy();
						});
					});
					it ('should shrink scale to the min/max range', function() {
						var chart = this.chart;
						var scale = chart.scales.x;
						var options = chart.options.scales.x;
						var min = '02/21 07:00';
						var max = '02/22 20:00';
						var minMillis = +moment(min, 'MM/DD HH:mm');
						var maxMillis = +moment(max, 'MM/DD HH:mm');

						options.min = min;
						options.max = max;
						chart.update();

						expect(scale.min).toEqual(minMillis);
						expect(scale.max).toEqual(maxMillis);
						expect(scale.getPixelForValue(minMillis)).toBeCloseToPixel(scale.left);
						expect(scale.getPixelForValue(maxMillis)).toBeCloseToPixel(scale.left + scale.width);
						scale.getTicks().forEach(function(tick) {
							expect(tick.value >= minMillis).toBeTruthy();
							expect(tick.value <= maxMillis).toBeTruthy();
						});
					});
				});
			});
		});
	});

	['auto', 'data', 'labels'].forEach(function(source) {
		['timeseries', 'time'].forEach(function(type) {
			describe('when ticks.source is "' + source + '" and scale type is "' + type + '"', function() {
				beforeEach(function() {
					this.chart = window.acquireChart({
						type: 'line',
						data: {
							labels: ['2017', '2018', '2019', '2020', '2021'],
							datasets: [{data: [0, 1, 2, 3, 4]}]
						},
						options: {
							scales: {
								x: {
									type: type,
									time: {
										parser: 'YYYY',
										unit: 'year'
									},
									ticks: {
										source: source
									}
								}
							}
						}
					});
				});

				it ('should not add offset from the edges', function() {
					var scale = this.chart.scales.x;

					expect(scale.getPixelForValue(moment('2017').valueOf())).toBeCloseToPixel(scale.left);
					expect(scale.getPixelForValue(moment('2021').valueOf())).toBeCloseToPixel(scale.left + scale.width);
				});

				it ('should add offset from the edges if offset is true', function() {
					var chart = this.chart;
					var scale = chart.scales.x;
					var options = chart.options.scales.x;

					options.offset = true;
					chart.update();

					var numTicks = scale.ticks.length;
					var firstTickInterval = scale.getPixelForTick(1) - scale.getPixelForTick(0);
					var lastTickInterval = scale.getPixelForTick(numTicks - 1) - scale.getPixelForTick(numTicks - 2);

					expect(scale.getPixelForValue(moment('2017').valueOf())).toBeCloseToPixel(scale.left + firstTickInterval / 2);
					expect(scale.getPixelForValue(moment('2021').valueOf())).toBeCloseToPixel(scale.left + scale.width - lastTickInterval / 2);
				});

				it ('should not add offset if min and max extend the labels range', function() {
					var chart = this.chart;
					var scale = chart.scales.x;
					var options = chart.options.scales.x;

					options.min = '2012';
					options.max = '2051';
					chart.update();

					expect(scale.getPixelForValue(moment('2012').valueOf())).toBeCloseToPixel(scale.left);
					expect(scale.getPixelForValue(moment('2051').valueOf())).toBeCloseToPixel(scale.left + scale.width);
				});
			});
		});
	});

	it ('should handle offset when there are more data points than ticks', function() {
		const chart = window.acquireChart({
			type: 'bar',
			data: {
				datasets: [{
					data: [{x: 631180800000, y: '31.84'}, {x: 631267200000, y: '30.89'}, {x: 631353600000, y: '33.00'}, {x: 631440000000, y: '33.52'}, {x: 631526400000, y: '32.24'}, {x: 631785600000, y: '32.74'}, {x: 631872000000, y: '31.45'}, {x: 631958400000, y: '32.60'}, {x: 632044800000, y: '31.77'}, {x: 632131200000, y: '32.45'}, {x: 632390400000, y: '31.13'}, {x: 632476800000, y: '31.82'}, {x: 632563200000, y: '30.81'}, {x: 632649600000, y: '30.07'}, {x: 632736000000, y: '29.31'}, {x: 632995200000, y: '29.82'}, {x: 633081600000, y: '30.20'}, {x: 633168000000, y: '30.78'}, {x: 633254400000, y: '30.72'}, {x: 633340800000, y: '31.62'}, {x: 633600000000, y: '30.64'}, {x: 633686400000, y: '32.36'}, {x: 633772800000, y: '34.66'}, {x: 633859200000, y: '33.96'}, {x: 633945600000, y: '34.20'}, {x: 634204800000, y: '32.20'}, {x: 634291200000, y: '32.44'}, {x: 634377600000, y: '32.72'}, {x: 634464000000, y: '32.95'}, {x: 634550400000, y: '32.95'}, {x: 634809600000, y: '30.88'}, {x: 634896000000, y: '29.44'}, {x: 634982400000, y: '29.36'}, {x: 635068800000, y: '28.84'}, {x: 635155200000, y: '30.85'}, {x: 635414400000, y: '32.00'}, {x: 635500800000, y: '32.74'}, {x: 635587200000, y: '33.16'}, {x: 635673600000, y: '34.73'}, {x: 635760000000, y: '32.89'}, {x: 636019200000, y: '32.41'}, {x: 636105600000, y: '31.15'}, {x: 636192000000, y: '30.63'}, {x: 636278400000, y: '29.60'}, {x: 636364800000, y: '29.31'}, {x: 636624000000, y: '29.83'}, {x: 636710400000, y: '27.97'}, {x: 636796800000, y: '26.18'}, {x: 636883200000, y: '26.06'}, {x: 636969600000, y: '26.34'}, {x: 637228800000, y: '27.75'}, {x: 637315200000, y: '29.05'}, {x: 637401600000, y: '28.82'}, {x: 637488000000, y: '29.43'}, {x: 637574400000, y: '29.53'}, {x: 637833600000, y: '28.50'}, {x: 637920000000, y: '28.87'}, {x: 638006400000, y: '28.11'}, {x: 638092800000, y: '27.79'}, {x: 638179200000, y: '28.18'}, {x: 638438400000, y: '28.27'}, {x: 638524800000, y: '28.29'}, {x: 638611200000, y: '29.63'}, {x: 638697600000, y: '29.13'}, {x: 638784000000, y: '26.57'}, {x: 639039600000, y: '27.19'}, {x: 639126000000, y: '27.48'}, {x: 639212400000, y: '27.79'}, {x: 639298800000, y: '28.48'}, {x: 639385200000, y: '27.88'}, {x: 639644400000, y: '25.63'}, {x: 639730800000, y: '25.02'}, {x: 639817200000, y: '25.26'}, {x: 639903600000, y: '25.00'}, {x: 639990000000, y: '26.23'}, {x: 640249200000, y: '26.22'}, {x: 640335600000, y: '26.36'}, {x: 640422000000, y: '25.45'}, {x: 640508400000, y: '24.62'}, {x: 640594800000, y: '26.65'}, {x: 640854000000, y: '26.28'}, {x: 640940400000, y: '27.25'}, {x: 641026800000, y: '25.93'}],
					backgroundColor: '#ff6666'
				}]
			},
			options: {
				scales: {
					x: {
						type: 'timeseries',
						offset: true,
						ticks: {
							source: 'data',
							autoSkip: true,
							maxRotation: 0
						}
					},
					y: {
						type: 'linear',
						gridLines: {
							drawBorder: false
						}
					}
				}
			},
			legend: false
		});
		const scale = chart.scales.x;
		expect(scale.getPixelForDecimal(0)).toBeCloseToPixel(29);
		expect(scale.getPixelForDecimal(1.0)).toBeCloseToPixel(494);
	});

	['data', 'labels'].forEach(function(source) {
		['timeseries', 'time'].forEach(function(type) {
			describe('when ticks.source is "' + source + '" and scale type is "' + type + '"', function() {
				beforeEach(function() {
					this.chart = window.acquireChart({
						type: 'line',
						data: {
							labels: ['2017', '2019', '2020', '2025', '2042'],
							datasets: [{data: [0, 1, 2, 3, 4, 5]}]
						},
						options: {
							scales: {
								x: {
									id: 'x',
									type: type,
									time: {
										parser: 'YYYY'
									},
									ticks: {
										source: source
									}
								}
							}
						}
					});
				});

				it ('should add offset if min and max extend the labels range and offset is true', function() {
					var chart = this.chart;
					var scale = chart.scales.x;
					var options = chart.options.scales.x;

					options.min = '2012';
					options.max = '2051';
					options.offset = true;
					chart.update();

					var numTicks = scale.ticks.length;
					var firstTickInterval = scale.getPixelForTick(1) - scale.getPixelForTick(0);
					var lastTickInterval = scale.getPixelForTick(numTicks - 1) - scale.getPixelForTick(numTicks - 2);
					expect(scale.getPixelForValue(moment('2012').valueOf())).toBeCloseToPixel(scale.left + firstTickInterval / 2);
					expect(scale.getPixelForValue(moment('2051').valueOf())).toBeCloseToPixel(scale.left + scale.width - lastTickInterval / 2);
				});
			});
		});
	});

	describe('Deprecations', function() {
		describe('options.time.displayFormats', function() {
			it('should generate defaults from adapter presets', function() {
				var chart = window.acquireChart({
					type: 'line',
					data: {},
					options: {
						scales: {
							x: {
								type: 'time'
							}
						}
					}
				});

				// NOTE: built-in adapter uses moment
				var expected = {
					datetime: 'MMM D, YYYY, h:mm:ss a',
					millisecond: 'h:mm:ss.SSS a',
					second: 'h:mm:ss a',
					minute: 'h:mm a',
					hour: 'hA',
					day: 'MMM D',
					week: 'll',
					month: 'MMM YYYY',
					quarter: '[Q]Q - YYYY',
					year: 'YYYY'
				};

				expect(chart.scales.x.options.time.displayFormats).toEqual(expected);
				expect(chart.options.scales.x.time.displayFormats).toEqual(expected);
			});

			it('should merge user formats with adapter presets', function() {
				var chart = window.acquireChart({
					type: 'line',
					data: {},
					options: {
						scales: {
							x: {
								type: 'time',
								time: {
									displayFormats: {
										millisecond: 'foo',
										hour: 'bar',
										month: 'bla'
									}
								}
							}
						}
					}
				});

				// NOTE: built-in adapter uses moment
				var expected = {
					datetime: 'MMM D, YYYY, h:mm:ss a',
					millisecond: 'foo',
					second: 'h:mm:ss a',
					minute: 'h:mm a',
					hour: 'bar',
					day: 'MMM D',
					week: 'll',
					month: 'bla',
					quarter: '[Q]Q - YYYY',
					year: 'YYYY'
				};

				expect(chart.scales.x.options.time.displayFormats).toEqual(expected);
				expect(chart.options.scales.x.time.displayFormats).toEqual(expected);
			});
		});
	});
});
